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CVE-2021-27646

Quick assessment

Affected
Synology Synology DiskStation Manager (DSM)
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Synology DiskStation Manager（DSM）是中国台湾群晖科技（Synology）公司的一套用于网络储存服务器（NAS）上的操作系统。该操作系统可管理资料、文件、照片、音乐等信息。 Synology DiskStation Manager 存在安全漏洞，该漏洞允许远程攻击者通过精心制作的web请求执行任意代码。

CVSS 9.8 · Critical EPSS 3.79% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-27646

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Use After Free vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via crafted web requests.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Synology DiskStation Manager 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Synology DiskStation Manager（DSM）是中国台湾群晖科技（Synology）公司的一套用于网络储存服务器（NAS）上的操作系统。该操作系统可管理资料、文件、照片、音乐等信息。 Synology DiskStation Manager 存在安全漏洞，该漏洞允许远程攻击者通过精心制作的web请求执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Synology Synology DiskStation Manager (DSM) unspecified ~ 6.2.3-25426-3 -

II. Public POCs for CVE-2021-27646

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
default-local-qwen3.6 · 14957 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2021-27646

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Vendor Advisories for CVE-2021-27646 (2)

Other References for CVE-2021-27646 (1)

Same Patch Batch · Synology · 2021-03-12 · 3 CVEs total

CVE-2021-26569 9.8 CRITICAL Synology DiskStation Manager 竞争条件问题漏洞
CVE-2021-27647 9.8 CRITICAL Synology DiskStation Manager 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: Synology DiskStation Manager (DSM)
Same vendor: Synology
Same weakness: CWE-416

V. Comments for CVE-2021-27646

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